A5083218351- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Terahertz technology and applications
- Laser-Matter Interactions and Applications
- Advanced Electron Microscopy Techniques and Applications
- Atomic and Molecular Physics
- Diamond and Carbon-based Materials Research
- Advanced Chemical Physics Studies
- Geomagnetism and Paleomagnetism Studies
- Crystallography and Radiation Phenomena
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Optical Polarization and Ellipsometry
- Photonic Crystals and Applications
- Near-Field Optical Microscopy
- Superconducting and THz Device Technology
- Surface and Thin Film Phenomena
- Gyrotron and Vacuum Electronics Research
- Quantum and electron transport phenomena
- Photocathodes and Microchannel Plates
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy
2020-2024
Freie Universität Berlin
2021
Fritz Haber Institute of the Max Planck Society
2021
Reliable modulation of terahertz electromagnetic waveforms is important for many applications. Here, we rapidly modulate the direction electric field linearly polarized pulses with 1–30 THz bandwidth by applying time-dependent magnetic fields to a spintronic emitter. Polarity more than 99% contrast at rate 10 kHz achieved using harmonic field. By adding static field, between angles of, instance, −53° and 53° kilohertz rates. We believe our approach makes emitters promising source low-noise...
In magnetic metals, electrical resistance depends on the direction of magnetization relative to current. New experiments show that this effect does not depend solely electron collisions, as is typically assumed.
Ultrafast control of magnetization on the nanometer length scale, in particular all-optical switching, is key to putting ultrafast magnetism path toward future technological application data storage technology. However, manipulation with light this scale challenging due wavelength limitations optical radiation. Here, we excite transient magnetic gratings a GdFe alloy periodicity 87 nm by interference two coherent femtosecond pulses extreme ultraviolet spectral range. The subsequent evolution...
All-optical switching (AOS) results in ultrafast and deterministic magnetization reversal upon single laser pulse excitation, potentially supporting faster more energy-efficient data storage. To explore the fundamental limits of achievable bit densities AOS, we have used soft X-ray transient grating spectroscopy to study magnetic response a GdFe alloy after spatially structured excitation with periodicity 17 nm. The spatial evolution combination atomistic spin dynamics microscopic...
Extending nonlinear spectroscopic techniques into the x-ray domain promises unique insight photoexcited charge dynamics, which are of fundamental and applied interest. We report on observation a third-order process in lithium fluoride (LiF) at free-electron laser. Exploring yield four-wave mixing (FWM) resonance with transitions to strongly localized core exciton states versus delocalized Bloch states, we find resonant FWM be sensitive probe for degree localization: Substantial sum-...
Time-resolved x-ray magnetic circular dichroism (XMCD) enables a unique spectroscopic view on complex spin and charge dynamics in multi-elemental materials. So far, its application the soft-x-ray range has been limited to synchrotron-radiation sources free-electron lasers. By combining laser-driven plasma source with thin-film polarizer, we generate up 30% polarization regime, enabling first XMCD spectroscopy at Fe L edges laser laboratory, our knowledge. Our approach can be readily adapted...
The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, chemistry biology, giving researchers access X-rays with unprecedented brightness, coherence and pulse duration. All XFEL facilities built until recently provided pulses at a relatively low repetition rate, limited data statistics. Here, results the first megahertz-repetition-rate scattering experiments Spectroscopy Coherent Scattering (SCS) instrument European...
The vision to manipulate and control magnetism with light is driven on the one hand by fundamental questions of direct indirect photon-spin interactions, other necessity cope ever growing data volumes, requiring radically new approaches how write, read process information. Here, we present two complementary experimental geometries access element-specific magnetization dynamics complex magnetic systems via ultrafast magneto-optical spectroscopy in extreme ultraviolet spectral range. First,...
Time-resolved resonant magnetic scattering in the soft-x-ray range is a powerful tool for accessing spatially resolved and element-specific spin dynamics materials. So far, application of this photon-demanding technique was limited to large-scale facilities. However, upgrades diffraction-limited storage rings supporting only x-ray pulses beyond 100 ps, shift free-electron lasers toward attosecond aggravate competition beamtime picosecond time window, which utmost relevance magnetism...
We introduce a wide-field magneto-optical microscope to probe magnetization dynamics with femtosecond temporal and sub-micrometer spatial resolution. carefully calibrate the non-linear dependency between of sample detected light intensity by determining absolute values polarization rotation. With that, an analytical transfer function is defined directly map recorded corresponding magnetization, which results in significantly reduced acquisition times relaxed computational requirements. The...
We present a laser-driven, bright, and broadband (50 to 1500 eV) soft-x-ray plasma source with <10 ps pulse duration. This is employed in two complementary, laboratory-scale beamlines for time-resolved, magnetic resonant scattering spectroscopy, as well near-edge x-ray absorption fine-structure (NEXAFS) spectroscopy. In both beamlines, dedicated reflection zone plates (RZPs) are used single optical elements capture, disperse, focus the soft x rays, reaching resolving powers up E/ΔE > 1000,...
We introduce a wide-field magneto-optical microscope to probe magnetization dynamics with femtosecond temporal and sub-micrometer spatial resolution. carefully calibrate the non-linear dependency between of sample detected light intensity by determining absolute values polarization rotation. With that, an analytical transfer function is defined directly map recorded corresponding magnetization, which results in significantly reduced acquisition times relaxed computational requirements. The...
We generate circularly-polarized soft X-rays from a laser-driven plasma source by magnetic thin-film polarizer. This enables first lab-based X-ray circular dichroism experiments at the Fe L edges with picosecond time resolution.
We utilize a thin-disk laser-driven plasma source to carry out resonant magnetic soft-X-ray scattering experiments follow ultrafast spin and lattice dynamics in artificial an-tiferromagnets.
The extension of nonlinear spectroscopic techniques into the x-ray domain is in its infancy but holds promise to provide unique insight dynamics charges photoexcited processes, which are fundamental as well applied interest. We report on observation a third order process lithium fluoride at free-electron laser. Exploring yield four wave mixing (FWM) resonance with transitions strongly localized core exciton states vs. delocalized Bloch states, we find resonant FWM be sensitive probe for...